Cutter-head.



H. DETTE.

Patented May 4, 1909.

UNITED sTArEs PATENToFFroE.

MAX HENRY DETTE, OF'WOODCLIFF, NEW JERSEY, ASSGNOR TO ALBERT PRYIBIL, OF

NEW YORK, N. Y.

CUTTER-HE AD.

Application filed September 14, 1907. Serial No. 892,885.

To all whom it may camera.:A

Be it known that I, MAX HENRY DETTE, a citizen of the United States, residing at Woodcliil', Hudson county, and State of New Jersey, have invented certain new and useful Improvements in Cutter-Heads, of which the following is a specification.

My improvements relate torotary cutter heads generally, and particularly f or those used in automatic feed planers, hand feed planers, molding machines and the like, in which a relatively high speed of rotation is essentiah-resulting in a centrifugal force which has heretofore been a great source of dangerl and disaster.

My object is not only to counteract this centrifugal force but also to utilize it as an element of safety,-the design being to afford an absolutely secure, simple, durable, chea erfectly balanced, structure adapted to al tiie requirements of practical use.

The invention consists in the specic'con-y struction and arrangement of parts hereinafter described and claimed.

In the accompanying drawings, Figure l, is an elevation of a cutter 'head embodying my invention; Fig. 2, a transverse section upon a larger scale taken upon line 2`2 Fig. 1; Fig. 3, is a similar view taken on lane of line 3-3- Fig. 1 Fig. 4, is a simi ar view taken upon plane of line 4*-4-V Fig. 1 Fig. 5, is an elevation of a portion of the clamping bar.

A, is a solid cutter head made in one piece. It may be made integral with the shaft or bored centrally and mounted on the latter as is customary in the case of short interchangeable cutter heads. In either case the essential feature is a one piece solid head in which the tool and clamp bar seats are directly formed. These seats consist of longitudinal grooves a, a, accurately milled out and parallel to each other and to the longitudinal axis of the head. Two of these grooves are shown in the drawings, although any plural number may be formed in a head of suitable diameter, provided they are equidistant, so as to preserve the accurate balance of the head. The outer side wall of cach groove constitutes a seat or abutment a', for the support of a cutter blade c. The

inner surface of this abutment a', is preferably in a plane parallel, or substantially parallel to a plane passing through the longitudinal axis of the head. Gage screws g, engaging with the head, project into each Specification of Letters Patent.

. ments a. that the backs of the cutting blades rest Patented May 4, 19'09.

roove a, at its inner or deeper portion, and iorm adjustable rests for t-he inner edge of the cutter blade c, as will be understood by reference to Fi 3. The latter is held in position against t e abutment a', by a clanipmg bar d, in the groove a, said clamping bar d, being pressed against the blade c, by means of a series of binding screws d', d', tapped into the head in positions at right angles to the inner surface of the abutment a', as shown in Fig. 2. Upon reference to Figs. 2, 3 and 4, it will be noted that the clamping bars d are 'oiiset at different points to correspond with the similar offsets in the cutter head A whereby I attain increased bearing lsurfaces and greater strain resisting bearings l tions.

The cutter head A, is recessed at a2, a2, and a3, as, so that the outer ends of both the set screws g, and of the binding screws d', d', ma be countersunk below the circular perip ery of said cutter head-while renderlng them still accessible for purposes of manipulation.

The edge of each groove a, opposed to the abutment a', (what may be designated as the inner edge) is formed with a shoulder a4, for enga ement with the edge or shoulder d2, on the c amping bar d, for the purpose of retaining the latter in place and counteracting the eii'ects of centrifugal force when the cutter head is in use.

In assembling the parts the clamping bars d, are first inserted in the grooves a, and then the cutting blades are inserted. After the cutting edges have been accurately set to an external -gage by means of the set screws g, the cutter blades c are locked in such position by means of the binding screws cl, which press the said blades rigidly against abut- It must be noted in this connection against the abutments a', so that the strain of cutting as well as of centrifugal force in use is directed afrainst said abutments and not against the clamping bars d, and screws d. By this arrangement also the centrifugal thrust of the clamping bars is against the cutting blades and away from the clamping Screws; while the said clamping bars d, are

Y shoulders a.

- distributed and permanently fixed with rela- 1 vature of the blades between the binding locked in positionand reinforced against all possibility of centrifugal displacement by the It will be seen that my cutter is very simple i and substantial in structure while at the same l time it is comparatively inexpensive. The cutting blades being backed and reinforced by the solid -head which bears all the strain in use, and centrifugal force being utilized to retain the parts in place all danger from high s eed of rotation is practically eliminated.

t will'also` be seen that the cuttinghead is perfectly balanced since the parts are evenly tion to the axis of rotation,the clam ing bars d, particularly being held in prescri ed, unvarying positions, with relation to the axis of rotation so that the perfect alinement of the cutter head as a whole is insured, owing to the absence of any tendency to eccentricity. The clamping bars extending the whole length of the cutting blades, distributes the pressure evenly over the whole of the latter and by counterbalancing the elasticity of the metal and preventing buckling or curscrews insure cutting edges which are in perfect alinernent lo Oitudinally and absolutely parallel with relation to each other and the central axis of the head. They also compensate for any variation in pressure longitudinally exertedby. the several binding screws. Furthermore the pressure exerted by the clampin bars d, and screws d', against the cutter b ades is at right angles to the latter and diametrically o posed to the supporting ing surfaces of the a utments a', so that during the operation of. clamping the blades in position there is no tendency to distribute their set or alinement. B this arrangement, also, as before intimated t e clamping screws d', are relieved of the strain of work which is thrown directly against and upon A.the solid one piece cutting head. To summarize'by m construction of cutter head, I attain simphcity, cheapness, strength, durability, rectangular pressure, v the counterb alancing yand utlllzation of centrifugal force and absolute sam in use.

at I claim as my invention and desire to secure by Letters Patent is,

The improved cutter head herein described comprising a solid head in one integral piece formed with tool and clamp bar seats consisting of longitudinal grooves milled out parallel to each other and to the lon itudinal axis of thehead, the outer side wal of each groove constituting an abutment for the support of a cutter b said abutment being parallel to a plane passing through the longitudinal axis of the head,

said head being recessed at diametrically op-A posite points and upon diametrically op osite sides, said grooves bein offset at dif erent points andI in different p anes, the edge of eac-h groove opposite the blade seat being formed with an offset and shoulder, combined with blades, clamp bars offset at differade, the inner surface of v ent points in different planes and seated in Y said grooves and formed with shouldersengaging thel shoulders of the rooves, set screws adjustably mounted in t e head and bearing against the rear edges of the blades,

and binding screws adjustable in the head at' rightv angles to the setl screws and bearin against the clamping bars adjacent saicgl shoulders and pressing the clam ing bars against the blades, the heads of? said set screws and binding screws being disposed in said recesses and readily endwise accessible.

MAX HENRY DETTE.

Witnesses:

D. W. GARDNER, Gino. WM. MIATT. 

